Last week, it released a 4TB version of its Aegis Secure Key 3, the highest-capacity hardware-encrypted USB drive of its kind. No, this is a quantum-resistant hardware-encrypted flash drive that you can slip into your pocket. Nobody else makes a hardware-encrypted USB flash drive above 512GB, so the 4TB Aegis Secure Key 3 has no direct competitor at that tier. ZDNET's buying adviceA 4TB flash drive that uses quantum-resistant cryptography isn't cheap, and the Aegis Secure Key 3 certainly isn't cheap -- given its $3,000 price tag. On paper, the Aegis Secure Key 3 has quite a fair bit of competition, but not when it comes to capacity.